How do i correct motif pattern java [closed]

the following expression have :

*891123456789112345678910000000000aaa.aaaa aaaaaa 3

a special caracters (*)at the begining of expression

50 digits

20 cracreters contains space and spécial characters

the number 0 indicates the end of the line

if(saisie.matches("\W\d{20}\d{13}\w(\s,.)\1"))